Power operated drill having fluid supply means



Jan. 14, 1969 K. R. BANGERTER ET A1. 3,421,392

POWER OPERATED DRILL HAVING FLUID SUPPLY MEANS I Filed July 26, 1967Sheet of 2 i 34o f- V I i .Ille so ,"1. g `45 g -47 12o /g -k 5o m'24F/G 2 sli i 52 S' g 9o ,|35c i* .88 -40` 68 INVENTORS iff: KENNETHBANGERTER 54 11W es se U/VE 5. 6A LE ATTORNEY.

Jan. 14, 1969 mRgANsan'rl-:R ETAL 3,421,392

POWER OPERATED `DRILL. HAVING FLUID SUPPLY MEANS Filed .my ze, 1967sheet 25 of 2 United States Patent O 9 Claims ABSTRACT OF THE DISCLOSUREA rpneumatically operated hand drill including passage means forsupplying uid through the drilling implement to a workpiece beingdrilled thereby. Fluid ow through the passage means is controlled by anormally closed valve which is arranged to be opened after the pneumaticmotor of the drill has been actuated by pressurized air.

Background of the invention The present invention relates to poweroperated tools and more particularly to power operated drills of thetype employed for drilling metallic and other similar workpieces.

During the operation of power operated drills of this type, a fluid isfrequently directed on the workpiece for treating the latter as it isdrilled. For example, during the drilling of extremely hard steelworkpeces, freon has been supplied to the workpieces for cooling andproviding them with a |hard iinish. Generally, however, this fluid hasbeen supplied by an apparatus which is separate from the drill andwhich, moreover, discharges the iluid continuously throughout the entireoperating cycle of the drill. rllhe employment of a separate apparatusfor supplying the uid is, of course, undesirable in that it addsappreciably to the expense, bulk, and complexity of the tools requiredfor the drilling operation. In addition, the aforementioned continuoussupplying of fluid throughout the entire operating cycle of the drill isundesirable as it wastes the expensive iluid employed.

Summary of the invention The present invention comprises the provisionof a new and improved power operated drill which is particularlyconstructed and arranged such that the uid is supplied to a workpieceonly when the workpiece is being acted on by the drill.

Another object of the invention is to provide a new and improved poweroperated drill of t-he type set forth which is particularly constructedand arranged such that the fluid is supplied to the workpiece throughthe drilling implement of the drill.

The aforegoing objects, and those other objects and advantages of theinvention which will be apparent from the following description taken inconnection with the accompanying drawings, are attained by the provisionof a power operated drill comprising driving means, control meansactuatable to cause operation of the driving means, and a drillingimplement including a working end adapted for drilling a workpiece andconnected to the driving means to be rotatably driven during theoperation of the latter. This power operated drill, moreover, comprisespassage means for supplying fluid to a workpiece adjacent theaforementioned working end of the drilling implement, and valve meansnormally preventing fluid flow through this Ipassage means andautomatically actuatable, in response to actuation of the control means,to permit iluid flow through the passage means. In addition, the drillalso comprises a tool housing surrounding the working end of thedrilling implement and movable upon engage- 3,421,392 Patented Jan. 14,1969 ice ment with a workpiece, and means for actuating the controlmeans in response to the movement of the tool housing.

Brief description of the drawings FIG. 1 is an elevational view,particularly broken away and in section, of a pneumatic hand drillincluding an embodiment of the present invention;

FIG. 2 is an enlarged, fragmentary sectional view of the drillillustrated in FIG. 1;

FIGS. 3-6 are fragmentary sectional views illustrating variouscomponents of the drill in their respective positions upon the initialactuation of the drill; and

FIGS. 7-10 are fragmentary sectional views illustrating said componentsof the drill during subsequent operation thereof.

Description of the preferred embodiment Referring more particularly tothe drawings wherein similar reference characters designatecorresponding parts thoughout the several views, FIG. l illustrates apneumatically operated hand drill designated generally as 10 whichcomprises a housing or casing formed to include an elongated barrel 12and a depending handle 14. The drill 10 is powered by a driving meanscomprising a vane type, pneumatic motor designated generally as 16 whichis positioned within a motor chamber 18 located adjacent the rearwardend 12b of the barrel 12. The motor 16, as illustrated in FIG. l,includes a rotor 20 wihich carries a plurality of vanes 22 and has anintegral stub shaft 24, rotatably mounted by a ball bearing 24a, at eachof its ends. Pressurized air for operating the motor 16 is supplied tothe dnill l() by a pneumatic supply 'hose 26 which is connected to thedrill 10 adjacent the lower end of the handle 14. The pneumatic supplyhose 26 communicates with the motor chamber 18 through an inlet passagemeans comprising an inlet bore 28, a valve chamber 30, and a supply bore32 such that pressurized air is supplied serially through the inlet bore28, the valve chamber 30, and the supply bore 32 to the motor chamber18.

The stub shaft 24 projecting from the forward end of the rotor 20 isconnected at 35 by straight splines to a driving sleeve 34 which isrotatably mounted in ball bearings 34a, 34b. The driving sleeve 34, inturn, is threadedly connected at 36 to a locking sleeve 38.

A drilling implement or tool 40, having a twisted forward or working end42, extends axially in the barrel 12 with its working end 42 in advanceof the barrel forward end 12a. The rearward end 44 of the drillingimplement 40 projects through the locking sleeve 38 into the bore 45 inthe driving sleeve 34. The drilling implement 40 is connected to themotor 16 to be rotatably driven thereby through a collet 46, including abore 47 tightly receiving the implement rearward end 44, which yhas asurface 46a frictionally engaging the driving sleeve 34 and is locked inposition by the locking sleeve 38.

The working end 42 of the drilling implement 40 is normally enclosedwithin a tool housing designated generally as 48 which is mounted foraxial slidable movement relative to the drilling implement 40. The toolhousing 48 comprises a rst or rearward housing element 50, including abore 52 slidably receiving the working implement 40 intermediate itsends, and a second or for ward housing element 54, including a bore 56normally containing the implement Working end 42, which is threadedlyconnected to the housing element 50 at 5S. The housing element 54 andthe working implement 40 are particularly `constructed and arranged suchthat the former normally projects in advance of the working end 42 ofthe latter. The bore 56 in the housing element 54, moreover, isconstructed of a diameter suliciently larger than that of the workingend 42 to enable cuttings to pass peripherally around the latter. Thehousing element 54 includes a plurality of slots 68 which communicatewith the bore 56 for discharging the cuttings therefrom.

The rearward end of the housing element 50 extends into chamber 60formed in the barrel forward end 12a and includes an enlargedcross-section piston 62. The tool housing 48 is forwardly biased by acoil spring 64, positioned circumferentially around the drillingimplement 40, which is arranged with its opposing ends en-.

gaging the piston 62 and an annular spring seat 66 formed integrallywith 4the barrel 12.

An inlet valve designated generally as 70 is provided for controllingthe flow of pressurized air to the motor 16. The inlet valve 70comprises a valve stem 72 which is slidably disposed within a bore 74,and a valve head 76, integral with one end of the valve stem 72, whichis interposed within the valve chamber 30 of the aforementioned inletpassage means. The valve Ihead 76 carries a sealing ring 78 and isbiased by a spring 80 arranged with its opposing ends engaging the valvehead 76 and a spring seat 82, to a closed position wherein it seats on avalve seat 84 to prevent air flow through the valve chamber 30. Thevalve s-tem 72 is constructed of sufficient length such that, with thevalve head 76 in this seated or closed position, the end 72a of thevalve stem 72 projects substantially from the bore 74.

The actuating means of the driill is particularly `constructed andarranged such that the inlet valve 70 is automatically triggered to anopen position in response to the engagement of the `housing element 54with a workpiece. More particularly, as illustrated in FIG. l, thehousing element 50 of the tool housing 48 includes an integrally formed,depending ilange 86 which is connected by a pin 88 lto one end of anactuating rod 90. The opposing end of the actuating rod 90 is slidablysupported in a bore 92 formed axially through a tubular connectingmember 94 which is, in turn, slidably carried by a support 96 threadedlyconnected in an annular ange 98 formed integrally with the barrel 12.

A wall of the connecting member 94 includes a pocket 100 containing alocking ba'll 102 which, with the drill 10 in the position illustratedin FIG. 1, locks the actuating rod 90 to the connecting member 94 forconjoined axial movement. The support 96, however, includes a recess 104which is arranged to communicate with the pocket 100 after the actuatingrod 90 and connecting member 94 have conjointly moved a predeterminedaxial distance. Thus, as will be understood, after this conjoinedmovement of the actuating rod 90 and the connecting member 94, thelocking ball 102 moves into the recess 104 to permit axial movement ofthe actuating rod 90 independently of the connecting member 94. Theextent of the aforementioned conjoined axia-'l movement of the actuatingrod 90 and connecting member 94 is. of course, adjustable by movement ofthe support 96 relative to the flange 98. Thus, as will be seen, thethreaded connecting between the support 96 and the ange 98 permits asimple, quick adjustment of this distance.

The connecting member 94 is slidably connected to one end of a triggerrod 106 which, adjacent its opposing end, is slidably supported by amounting pin 108 carried by the handle 14. An actuating lever 110 ispivotally mounted by a pivot pin 112 upon the handle 14 intermediate thetrigger rod 106 and the end 72a of the valve stem 72. The actuatingylever 110, as illustrated in FIG. 1, includes a linger-like `portion114 engaging the trigger rod 106 and also has an end engaging the end72a of the valve stem 72. Thus, axial movement of the trigger rod 106causes pivotal movement of the actuating lever 110 which, in turn, urgesthe inlet valve 70 to an open position.

A supply hose 116, communicating with a source (not shown) of oil, Freonor other fluid suitable for treating a workpiece during the drillingoperation, is connected to the handle 14 adjacent the lower end of thelatter. The drill 10 is provided with a passage means which communicateswith the supply hose 116 for conveying fluid from the latter through thedrilling implement 40 to a workpiece drilled by the drill 10.

More particularly, this passage means comprises a valve chamber 118,formed in the handle 14 in direct communication with the supply hose116, which is arranged to discharge fluid through an outlet port 120into a bore 122. The bore 122 communicates with one end of a uidconveying hose 124 which, at its opposing end, communicates with a bore126 formed through a connecting element 128 carried by the rearward end12b of the barrel 12. A bore 130 is formed axially through the rotor 20and the stub shafts 24 of the motor 16 in communication with the bore126 and discharges uid received from the latter into the bore 45 in thedriving sleeve 34. A bore 132 is formed axially through the drillingimplement 40 and communicates with the bore 45 to receive the fluidtherefrom. The bore 132 discharges this fluid onto a workpiece throughan oriice 134 which, as shown in FIG. 7, is formed in the working end 42of the drilling implement 40. The sealing elements 135:1, 135b, and135e` are provided for preventing fluid leakage from the passage means.

A valve means designated generally as 136 is located in the valvechamber 118 for controlling the flow of fluid through the aforedescribedpassage means. The valve means 136, more particularly, comprises a valvestem 138 which slidably extends through a bore 140, and a valve head 144which is rigidiy mounted upon one end of the valve stem 138 and disposedin the valve chamber 118. The valve head 144 carries a sealing ring 146and is biased by a spring 148 to a closed position wherein it seats on avalve seat 150 to prevent fluid flow from the supply hose 116 to theoutlet port 120. The valve stem 138 is aligned with the inlet valve 70and constructed of suitable length such that, with the valve head 144 inthe seated or closed position, the end 138a of the valve stem 138projects through the opening 142 in the spring seat 82, but issuiciently spaced from the valve head 76 of the inlet valve 70 to enablethe valve 70 to be opened before the valve head 76 urges the valve means136 to an open position.

This spaced arrangement of the valve 70 and the valve means 136, inaddition to conserving the freon or similar Huid, provides a safetyfeature in that, it reduces the possibility of the fluid causing injuryin the event of accidental operation of the drill 10.

From the foregoing description, it will be seen that, with the drill 10in non-operating condition as illustrated in FIG. 1, the inlet valve 70and the valve means 136 are maintained in closed positions by thesprings 80 and 148, respectively. Thus, at this time, the inlet valve 70prevents pressurized air from flowing to the motor 16; and the valvemeans 136 similarly prevents tluid from owing to the bore 132 in thedrilling implement 40.

However, when the housing element 54 of the tool housing 48 is engagedwith a workpiece 152, as illustrated in FIG. 3, the tool housing 48 isurged rearwardly against its biasing spring 64. This movement of thetool housing 48 causes the working end 42 of the drilling implement 40to engage the workpiece 152 and, as the actuating rod 90 is locked tothe connecting member 94 by the locking ball 102 as shown in FIG. 4,simultaneously provides conjoined axial movement of the actuating rod 90and the connecting member 94. This axial movement of the connectingmember 94, in turn, causes axial movement of the trigger rod 106 andresultant pivotal movement of the actuating lever 110. Thus, the inletvalve 70 is urged to an open position wherein pressurized air from thepneumatic supply hose 26 ows to the motor 16 through the aforementionedinlet passage means. The inlet valve 70 and the valve means 136, asaforedescribed, are sull-lciently spaced such that, as shown in FIGS. 5and 6, the initial opening of the inlet valve 70 has no effect upon thevalve means 136.

The continued rearward movement of the tool housing 48, however, acts(through the actuating rod 90, the connecting member 94, the trigger rod106, and the actuating lever 110) to sufficiently displace the inletvalve 70 such that the latter urges the valve means 136 to an openposition. Thus, although the initial actuation of the motor 16 (andhence the initial portion of the drilling operation) is not accompaniedby uid ow through the bore 132 to the workpiece 152, the succeedingportions of the drilling operation are accompanied by such iluid flow.(It will be understood, however, that, if desired, tluid ow could beprovided during the initial portion of the drilling operation byproviding the drill with a suitably constructed drill template (notshown).)

When the tool housing 48 has been sufciently rearwardly moved, asillustrated in FIG. 7, to cause alignment of the slots 100, 104, asshown in FIG. 8, the locking ball 102 unlocks the actuating rod 90 fromthe connecting member 94. Thus, although the inlet valve 70 and thevalve means 136 are maintained in open positions 'as illustrated inFIGS. 9 and 10 during subsequent drilling in the workpiece 152, theactuating rod 90 moves axially relative to the connecting member 94.This relative axial movement, as will be understood, enables thedrilling implement 40 to form a deeper bore than would be normallypossible were the actuating rod 90 and the connecting member 94continuously connected for conjoined axial movement.

After the drilling operation, the removal of the drill 10 from theworkpiece 152 enables the spring 64 to return the tool housing 48 to itsFIG. l position, whereupon the springs 80 and 148 automatically returnthe inlet valve 70 and the valve means 136, respectively, to closedpositions. Then the drill 10 is ready to drill another hole in theaforedescribed manner.

From the aforegoing it will be seen that we have provided new andimproved means for accomplishing all of the objects and advantages ofour invention. It will be understood, however, that, although we haveillustrated and hereinbefore specifically described only a singleembodiment of our invention, the invention is not limited merely to thissingle embodiment, but rather contemplates other embodiments andvariations employing its teachings and concepts.

Having thus described our invention, we

1. A power operated drill comprising:

a tluid operated motor;

inlet passage means for supplying pressurized fluid to said motor;

inlet valve means normally preventing uid flow through said inletpassage means and actuat'able to permit fluid ilow therethrough;

a drilling implement inclu-ding a working end adapted for drilling aworkpiece and connected to said motor to be rotatably driven thereby;

second passage `means for supplying uid to a workpiece adjacent saidworking end of said drilling implement;

`second valve means normally preventing fluid ow through said secondpassage means and automatically actuatable, in response to actuation ofsaid inlet valve means, to permit uid flow through said second passagemeans;

a `tool housing surrounding said working end of said drilling implementand movable relative thereto upon engagement with a workpiece; and

means for actuating said inlet valve means in response to the movementof said tool housing.

2. A power operated drill according to claim 1, further comprising saidactuating means including la rst actuating member movable in response tomovement of said tool housing and a second actuating mem'ber normallyconnected to said first actuating member for conjoined movementtherewith and separable from said first actuatclaim ing 'member after apredetermined distance of said conjoined movement.

3. A power operated drill according to claim 2, further comprising levermeans pivotable in response to movement of said `second actuatingmember, said valve means being arrange-d such that pivotal movement ofsaid lever means actuates said inlet valve means and the latter, inturn, actuates said second valve means.

4. A power operated drill according to claim 2, further comprising saidactuating members telescoping one into another, and detent meansinterconnecting said members for said conjoined movement.

5. A power operated drill according to claim 1, further comprising saidactuating means including a first actuating member axially movable uponmovement of said tool housing and a second actuating member including alongitudinal bore slidably receiving said first actuating member, asupport slidably supporting said second actuating member, and detentmeans interconnecting said actuating members for conjoined axialmovement, said support including a recess arranged to receive saiddetent means after a predetermined distance of said conjoined movementwhereby, after said predetermined distance, said first actuating memberis axially movable relative to said second actuating member.

6. A power operated drill according to claim 1, further comprising saidtool housing being spaced from said drilling implement to providepassage means therebetween, and slot means in said tool housingcommunicating with such passage means for discharging cuttingstherefrom.

7. A power operated drill according to claim 1, further comprising saidmotor including a rotor, a driving sleeve rotatably driven by said motorand rotatably driving said drilling implement, and said second passagemeans inc1uding communicating bores through said rotor, said `drivingsleeve, and said drilling implement whereby said second passage meanssupplies fluid through said working end of said drilling implement.

8. A power operated drill comprising:

driving means;

control means actuatable to cause operation of said driving means;

a drilling implement including a working end adapted for drilling aworkpiece and connected to said driving means to be rotatably drivenduring the operation of said driving means;

passage means for supplying fluid to a workpiece adjacent said workingend of said drilling implement;

valve means normally preventing fluid ow through said passage means andautomatically actuatable, in response to actuation of said controlmeans, to permit fluid flow through said passage means;

a tool housing surrounding said working end of said drilling implementand movable upon engagement with a worpiece; and

means for actuating said control means in response to the movement ofsaid tool housing.

9. A power operated drill according to claim 8, further comprising saidvalve means being arranged to be actuated after said control meanscauses operation of said driving means.

References Cited UNITED STATES PATENTS 1,102,012 6/1914 Curnow 173--79XR 1,630,835 5/1927 Doyle 77 55.3 1,698,970 1/1929 shaft 173-49 XRFOREIGN PATENTS 633,052 12/1949 Great Britain.

FRANCIS S. HUSAR, Primary Examiner.

U.S. Cl. X.R.

